powerpc, 5xxx, 512x: remove support for mpc5xxx and mpc512x

There was for long time no activity in the mpx5xxx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in mpc5xxx,
so remove it.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index a7b76f4..ce8ba99 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -33,11 +33,11 @@
 	  used to preserve the bad block marker in the OOB area.
 
 config NAND_VF610_NFC
-	bool "Support for Freescale NFC for VF610/MPC5125"
+	bool "Support for Freescale NFC for VF610"
 	select SYS_NAND_SELF_INIT
 	help
 	  Enables support for NAND Flash Controller on some Freescale
-	  processors like the VF610, MPC5125, MCF54418 or Kinetis K70.
+	  processors like the VF610, MCF54418 or Kinetis K70.
 	  The driver supports a maximum 2k page size. The driver
 	  currently does not support hardware ECC.